JPH0452395A - Construction method for docking of shield tunnel underground - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to underground docking of a shield tunnel, in which a pair of shield tunneling machines are made to face each other, and the tips of both shield tunnels are connected underground. Regarding construction methods.

(Conventional technology) In general, in the shield method, there is a limit to the length of excavation that can be made by one shield tunneling machine, and when constructing a long tunnel, a shaft is dug at each limit length and the cutter of the tunneling machine is replaced. The method used is to use another excavator to dig to the next shaft.

However, building horizontal shafts at small intervals increases the cost accordingly, so the distance between the shafts is lengthened, and a pair of shield tunneling machines are used to dig in opposite directions, allowing both tunnels to be dug underground. A method has been developed to do so.

On the other hand, when a shield tunnel is docked underground in a ground with high water pressure and low stability, such as an undersea tunnel, there is a problem that there is a high risk of water leakage or collapse of the ground.

For this reason, the conventional underground docking method in such ground involves freezing the ground around the docking part or injecting a chemical solution into the ground to cause it to bend and solidify, thereby stopping the water and causing the ground to collapse. A method of preventing
A method has been developed to pass the wire between both shield tunneling machines.

(Problems to be Solved by the Invention) The conventional method of freezing the ground described above requires a long time and a large amount of construction cost to complete freezing, and the method of injecting a chemical solution requires injecting a large amount of an expensive chemical solution. Therefore, there was a problem that it required a lot of cost and that sufficient consolidation could not be expected in cases where there was a flow of underground water.

In addition, in the method of hanging and passing the connecting tube, it is necessary to excavate the ground between both shield excavators before protruding the connecting tube.
If the ground is extremely unstable, it cannot be carried out on its own and requires the use of freezing methods or chemical injection.

The present invention has been developed in consideration of the problems of various conventional construction methods as described above.
The purpose of this invention is to provide an underground docking method for shield tunnels that allows for quick and safe docking at low cost.

(Means for Solving the Problems) A feature of the present invention for solving the conventional problems as described above is that a pair of shield excavators are excavated in directions opposite to each other, and the two shield excavators are used to excavate underground. In an underground docking method for shield tunnels that communicates shield tunnels with each other, a rotatable material is provided on the outer periphery of the tip of the shield tube of one of the two shield tunneling machines, and is rotatable and protrudes in the extending direction of the tip side of the shield tube. A docking seal cylinder that can be driven and has a cutter bit protruding from its tip is provided, and the docking seal cylinder is provided with a solidifying agent injection path with a discharge port opened on the inner surface of the tip of the cylinder, and the other shield The tip of the tunneling machine is shaped so that it fits into the docking seal cylinder, and after the two shield tunneling machines are brought close to each other in a facing arrangement, the docking seal cylinder is rotated from one shield tunneling machine to seal the ground. Move it forward while cutting the inside, and after the tip reaches the outside of the outer periphery of the tip of the shield tube of the other shield excavator, the outer circumferential surface of the tip of the shield tube of the other shield excavator and the inner periphery of the tip of the seal tube for docking. A liquid solidifying agent is injected between the surfaces through the solidifying agent injection path, and after the solidifying agent is solidified, excavation is performed between the two shield excavators to make them communicate with each other.

(Function) The construction method of the present invention allows both shield tunneling machines to be brought close to each other with the same precision, and the docking seal cylinder on one side is moved forward while rotating, thereby forming a cylindrical shape corresponding to the wall thickness of the docking seal cylinder. The spring is cut, and the seal tube for docking moves forward inside it. When the tip of the docking seal tube reaches the outer periphery of the tip of the opposing shield excavator, the cutter tube is passed between both shield tubes, and the collapse of the ground outside the shield tube is prevented. In this state, by feeding liquid solidifying agent into the solidifying agent injection channel from within the shield excavator on one side, water is sealed between the inner surface of the tip of the cutter tube and the outer surface of the shield tube inside it, completely preventing leakage of groundwater. will be cut off.

(Example) Next, an example of implementation of the present invention will be described with reference to the drawings.

1 to 3 show one side of the shield excavation fiA used in the present invention. In the figure, 10 is a cylindrical shield tube, 11 is a segment assembly device, 12 is a lining wall made of segments, and 13 is a jack for pushing out the shield tube 10 by applying a reaction force to the lining wall.

Inside the tip of the shield tube 10, there is a partition wall 1 that blocks the front and back.
4 is provided, and the front side thereof is used as an excavation and kneading chamber 15.

A bearing 16 is fixed to the center of the partition wall 14, and a cutter shaft 17 is slidably supported in the bearing 16 in the axial direction.

At the tip of the cutter shaft 17, four cutter spokes 18, 18, .
9 has a kneading bit 20 protruding from the rear side, and a copy cutter 21 is provided at the tip so as to be freely removable in the axial direction, and a hydraulic cylinder in the cutter spoke 18 as shown in FIG. 22 for entry and exit operations.

The rear end of the cutter shaft 17 is rotatably and immovably connected to the drive frame 23, and is rotatably driven by a hydraulic motor 24 supported by the drive frame 23. It has become.

The driving frame 23 is a shield P! It is supported to be non-rotatable and movable in the axial direction with respect to J10, and is reciprocated in the axial direction of the cutter shaft 17 by the hydraulic cylinder 25.

26 in the figure is an excavated soil discharge device.

A docking seal P530 is installed on the outer periphery of the tip of the shield tube 10 so as to be movable in the forward extending direction and rotatable with respect to the shield P510. When the docking seal tube 30 is in the most retracted position, its tip protrudes longer than the tip of the shield tube 10, and a cutting bit 31 is fixed to the circumferential surface of the tip.

Further, on the inner surface of the dotting seal cylinder 30, grooves 3 for engaging cutter spokes are provided at least in two axially symmetrical locations.
As shown in FIG. 3, a plurality of 2.32... are molded at intervals in the axial direction. Then, by pulling the cutter spoke 18 into the dotting seal I'I30 and protruding the copy cutter 21 with the tip facing the groove 32, the tip of the copy cutter 21 is engaged in the groove 32. By operating the cutter spoke 18 in this state, the docking seal cylinder 30 is also operated.

This docking seal cylinder 30 has a large number of discharge ports 33 for injecting a solidifying agent opened at regular intervals in the circumferential direction on the inner circumferential surface of the tip thereof.

Each discharge port 33 communicates with a continuous solidifying agent injection path 34,
The base end 34a of the injection path 34 or the docking seal cylinder 30
It is opened on the inner peripheral surface of the rear end side.

On the other hand, the shield tube 10 includes a seal tube 30 for docking.
A working window 35 is provided at a position facing the proximal end 34a of the injection path 34 when the injection path 34 moves forward, and is normally closed at 1I 35a.

Next, a shield tunnel docking method using the shield tunneling machine configured as described above on one side will be explained.

As shown in Figure 4 (a), one of the shield excavations 1 described above is carried out from both ends of the tunnel to be excavated! mA and
The other shield excavator B is made to excavate in the opposite direction.

The shield excavation alB has the same structure as the shield excavation 11A described above, except that the shield flo is extended toward the tip side to form the excavation and kneading chamber 15 instead of the docking seal cylinder 30. However, this shield tunneling machine B uses a shield cylinder 10 whose outer diameter at least at the tip is smaller than the docking seal cylinder 30 described above.

In addition, in the figure, the same components of both shield tunneling machines A and B are given the same reference numerals, and the explanation thereof will be omitted.

Both shield tunneling machines A and B are excavated together to sequentially excavate and form shield tunnels a and b.

At this time, the shield excavator A excavates the docking seal tube 30 as a part of the shield tube 10 without rotating it with the docking seal tube 30 in the most retracted state as shown in FIG. 4(A). Then, the course is adjusted underground, and the two shield cylinders 10, 10 are brought close to each other at a predetermined position with their axes aligned. Then, the excavation is stopped with the ground 38 remaining between the two.

Next, seal f! for dotting cutter spoke 18!
The copy cutter 21 is inserted into the tip of the cutter 30, the tip is opposed to the groove 32, the copy cutter 21 is protruded, and the tip is inserted into the groove 3.
Insert it into 2. In this state, the cutter spoke 18 is rotated and moved forward.

As a result, the docking seal cylinder 30 rotates as shown in FIG. 4(b), and moves forward while cutting the earth into a cylindrical shape with the cutting bit. Then, after advancing the hydraulic cylinder 25 for the cutter spoke 18 by one stroke, it is stopped and the copy cutter 21 is pulled in. The cutter spoke 18 is pulled back, and the copy cutter 21 is projected and engaged with another groove 32. Change the position and move it forward while rotating it again.

This is repeated to move the docking seal tube 30 forward, and its tip reaches outside the outer periphery of the tip of the shield tube 10 of the other shield excavation 11B, as shown in FIG. 4(c).

Next, the window 35 between the shields of the shield tunneling machine A is opened, and the docking seal tube 30 is rotated and stopped so that the base end 34a of the solidifying agent injection path 34 faces the window 35, and the docking seal cylinder 30 is stopped. A tube 36 from an injection pump is connected to the proximal end 34a, and a liquid solidifying agent is injected. As a result, the solidifying agent is transferred from the discharge port 33 to the docking seal vJ.
It is injected into the gap 37 between the inner surface of the shield tube 30 and the outer surface of the tip of the shield tube 10 of the other shield IIB, and closes the gap.

In this way, the docking seal tube 30 is dug into both seals 1! After passing the hook between the tips of the shield cylinders mA and B, rotate one of the cutter spokes 18 to excavate the remaining unexcavated area, then remove the cutter frame such as the cutter spoke and bulkhead, and excavate the tunnels a and b. communicate,
Double shield simple 1010 and docking seal WJ30
A lining will be constructed on the inside of the area.

(Effects of the Invention) As described above, the shield tunnel docking method of the present invention rotates and advances the docking seal cylinder equipped with a cutting bit at the tip from the outer periphery of the shield cylinder of one shield excavator, thereby cutting the ground. While cutting it into a cylindrical shape, extend it to the outer periphery of the tip of the other shield excavator, pass the docking seal tube between both shield tubes, inject a solidifying agent from the discharge port on the inner surface of the tip of the docking seal tube, and By excavating the ground left inside after sealing the gap between the inner surface of the seal cylinder and the outer surface of the shield cylinder, it is easy to inject the solidifying chemical, and the amount used is less than that of the dotting seal. It is only necessary to inject into a small gap between the tube, the inner surface of the tip, and the outer surface of the tip of the other shield tube.
With this, the insides of both shield cylinders are completely connected with the ground remaining inside, and the docking work can be performed quickly and safely at low cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one example of the shield tunneling machine used in the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a partial perspective view of the inner surface of the docking seal cylinder. , Figure 4 (
A) to (C) are cross-sectional views of the dotting work process. A, B...Shield excavator, a, b...Shield tunnel, 1...
Segment assembly device, 12... Lining wall, 3...
... Jyatsuki, 14 ... Bulkhead, 5 ...
...Drilling and kneading chamber, 16...Bearing, 7.
... Cutter shaft, 18 ... Cutter spoke, 9 ... Cutter bit, 20 ...
・Kneading bit, 1... Copy cutter, 22
...Cylinder 3... Frame, 24...
... Hydraulic motor 5 ... Hydraulic cylinder 6 ... Excavation soil discharge device, 30 ... Seal tube, 1 ... Cutting bit, 32 ... ... Concave eraser, 3 ... Discharge port, 34 ... Injection path,
4a... Base end, 35... Window, 5a...
...Lid, 36...Tube, 37...
...Gap 8...Ground. Applicant Pentayo Construction Co., Ltd. No. 4 11! I (A) Figure 4 (B) Figure (C) Δ

Claims (1)

[Claims] In an underground docking method for shield tunnels, in which a pair of shield tunneling machines are excavated in opposite directions, and the shield tunnels formed by both shield tunneling machines are connected to each other underground, one of the shield tunneling machines is A docking seal cylinder is provided on the outer periphery of the distal end of the shield cylinder, which can freely protrude in the direction of extension of the distal end of the shield cylinder, can be rotated, and has a cutter bit protruding from the tip;
The docking seal tube is provided with a solidifying agent injection path with a discharge port opened on the inner surface of the tip end of the tube, and the tip of the other shield tunneling machine is shaped to fit into the docking seal tube. After the two shield tunneling machines are brought close to each other in a facing arrangement, the docking seal tube is rotated from one shield tunneling machine to advance while cutting underground, and its tip is attached to the shield of the other shield tunneling machine. After reaching the outside of the outer periphery of the tip of the cylinder, a liquid solidifying agent is injected through the solidifying agent injection path between the outer peripheral surface of the tip of the shield cylinder of the other shield tunneling machine and the inner peripheral surface of the tip of the docking seal cylinder. This underground docking method for shield tunnels is characterized by waiting for the solidification agent to solidify before excavating between both shield tunneling machines and making them communicate with each other.